Investigation of high-temperature oxygen release from LA2NiO4+δ oxide in quasi-equilibrium mode

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Abstract

A continuous phase diagram δ (pO2, T) of a nonstoichiometric oxide La2NiO4+δ with a layered perovskite-related Ruddlesden-Popper structure was obtained by the method of quasi-equilibrium oxygen release. The thermodynamic parameters are determined as functions of oxide nonstoichiometry δ. The calculation was carried out within the framework of the models of a localized electron and a free electron, which are used to describe the defect structure of ferrites and cobaltites, respectively. It is shown that the features of the phase diagram can be related to the density of electronic states near the Fermi level of electrons.

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About the authors

E. S. Tropin

Institute of Solid State Chemistry and Mechanochemistry of Siberian Branch of Russian Academy of Sciences

Author for correspondence.
Email: evg2306@mail.ru
Russian Federation, Novosibirsk

M. P. Popov

Institute of Solid State Chemistry and Mechanochemistry of Siberian Branch of Russian Academy of Sciences

Email: popov@solid.nsc.ru
Russian Federation, Novosibirsk

R. D. Guskov

Institute of Solid State Chemistry and Mechanochemistry of Siberian Branch of Russian Academy of Sciences

Email: evg2306@mail.ru
Russian Federation, Novosibirsk

A. P. Nemudry

Institute of Solid State Chemistry and Mechanochemistry of Siberian Branch of Russian Academy of Sciences

Email: evg2306@mail.ru
Russian Federation, Novosibirsk

References

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Supplementary files

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2. Fig. 1. Setup for measuring oxygen exchange in SIEP oxides.

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3. Fig. 2. X-ray diffraction pattern of a slowly air-cooled LNO sample.

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4. Fig. 3. Initial experimental data on oxygen evolution from LNO.

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5. Fig. 4. Dependence of pO2 on time for a temperature of 850°C at different helium flow rates (a) and its affine transformation (b).

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6. Fig. 5. Equilibrium phase diagram 4+δ – ln pO2 – T LNO (T = 600–850°C) in comparison with literature data [5].

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7. Fig. 6. LNO isotherms at 600°C (a) and 850°C (b).

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8. Fig. 7. Dependence of the parameter β on temperature.

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Note

Публикуется по материалам IX Всероссийской конференции с международным участием “Топливные элементы и энергоустановки на их основе”, Черноголовка, 2022.


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